Moto Guzzi Quota 1000 and Quota 1100 ES models
Thanks to Gene Grefe for this information (in his own words):
I had great success dealing direct with the company Mistral in Italy to get the exhaust crossover for the Quota. I couldn't locate one from a couple of dealers so I researched and came up with factory. They were really great and it didn't take much over a week to get it. Then I had to have my bank electronic transfer money to them. The e-mail address is to Mistral and the fellow who I corresponded with is as follows: firstname.lastname@example.org. The price was 180 euro for the pipe and 50 euro shipping. His name is Micheli Romano and as I stated they were great in informing and getting me the pipe. He also stated they are in process of coming up with a new muffler for Quota also.